Question 1

The radiation era lasted for only the first few billion years of the Big Bang.

Accepted Answer

A) True 
 B)False

Question 2

Relate the age of the universe to the Hubble constant.

Accepted Answer

Inverting the Hubble constant ...

Question 3

After the decoupling, the universe was to radiation.

Accepted Answer

The answer of After the decoupling, the universe was to...

Question 4

The discovery of the cosmic microwave background was important because

Accepted Answer

A)   its detection was a major advance in microwave testing.
B)   it established a firm center of the universe.
C)   it proved that astronomy at radio wavelengths was possible.
D)   it showed the universe must be closed, with more than the critical density here.
E)   it was experimental verification of a prediction from the Big Bang theory.

Question 5

Einstein's constant has been revived to help us explain dark energy.

Accepted Answer

The answer of Einstein's constant has been revived to help...

Question 6

The cosmological principle is the ultimate extension of the Copernican principle to the entire universe, in that there is no center at all.

Accepted Answer

A) True 
 B)False

Question 7

Of normal matter, about 25% of it by mass is still primordial helium even today.

Accepted Answer

A) True 
 B)False

Question 8

The carbon in your DNA was fused in the first few minutes of the Big Bang.

Accepted Answer

A) True 
 B)False

Question 9

With a Hubble constant of 70 km/sec/Mpc, the critical density would be

Accepted Answer

A)   3 × 10- 31 g/cc.
B)   9 × 10- 27 kg/m3.
C)   6.23 × 10- 23 g/mole.
D)   4 × 10- 36 g/cc.
E)   1.4 g/cc.

Question 10

The redshift of the galaxies is correctly interpreted as

Accepted Answer

A)   the differences in temperatures and star formation in old and young galaxies.
B)   a Doppler shift due to the random motions of galaxies in space.
C)   an aging of light as gravity weakens with time.
D)   space itself is expanding with time, so the photons are stretched while they travel through space.
E)   placing our Galaxy near the center of the Local Group.

Question 11

In the cosmological principle, we can easily test cosmic homogeneity with the redshift surveys, but isotropy cannot be so tested.

Accepted Answer

A) True 
 B)False  False

Question 12

Deuterium abundance suggests that normal matter makes up only 3- 4% of the critical density.

Accepted Answer

A) True 
 B)False

Question 13

The COBE data, combined with computer simulations, strongly supported the epoch, showing how ripples in the background radiation could collapse into galaxies over time.

Accepted Answer

The answer of The COBE data, combined with computer simulations,...

Question 14

Why do population II stars contain almost nothing but hydrogen and helium?

Accepted Answer

This first generation of stars must be made of the elements produced in primordial nucleosynthesis, which had time only to turn 25% of the hydrogen into helium.

Question 15

In the Big Bang, about 75% of the normal matter by mass was hydrogen atoms, and the other 25% almost entirely helium.

Accepted Answer

A) True 
 B)False

Question 16

Most of the deuterium formed right after the Big Bang

Accepted Answer

A)   turned into dark matter.
B)   was found in the globular clusters.
C)   broke down into electrons and neutrons.
D)   quickly burned into helium nuclei.
E)   is still around today.

Question 17

Decoupling refers to the separation of matter and antimatter during inflation.

Accepted Answer

A) True 
 B)False

Question 18

If the value of H is doubled, it would also double the age of the universe.

Accepted Answer

A) True 
 B)False

Question 19

What role did Princeton astronomers play in the research on the Big Bang?

Accepted Answer

Even before Bell Labs found it, they predicted the existence of the cosmic microwave background radiation.

Question 20

Like dark matter, dark energy will also retard the expansion of the universe.

Accepted Answer

A) True 
 B)False

Exam 18: Cosmology: the Big Bang and the Fate of the Universe

The radiation era lasted for only the first few billion years of the Big Bang.

Correct AnswerverifiedShow Answer

Relate the age of the universe to the Hubble constant.

Correct AnswerverifiedInverting the Hubble constant ...View AnswerShow Answer

After the decoupling, the universe was to radiation.

Correct AnswerverifiedShow Answer

The discovery of the cosmic microwave background was important because

Correct AnswerverifiedShow Answer

Einstein's constant has been revived to help us explain dark energy.

Correct AnswerverifiedShow Answer

The cosmological principle is the ultimate extension of the Copernican principle to the entire universe, in that there is no center at all.

Correct AnswerverifiedShow Answer

Of normal matter, about 25% of it by mass is still primordial helium even today.

Correct AnswerverifiedShow Answer

The carbon in your DNA was fused in the first few minutes of the Big Bang.

Correct AnswerverifiedShow Answer

With a Hubble constant of 70 km/sec/Mpc, the critical density would be

Correct AnswerverifiedShow Answer

The redshift of the galaxies is correctly interpreted as

Correct AnswerverifiedShow Answer

In the cosmological principle, we can easily test cosmic homogeneity with the redshift surveys, but isotropy cannot be so tested.

Correct AnswerverifiedFalse

Deuterium abundance suggests that normal matter makes up only 3- 4% of the critical density.

Correct AnswerverifiedShow Answer

The COBE data, combined with computer simulations, strongly supported the epoch, showing how ripples in the background radiation could collapse into galaxies over time.

Correct AnswerverifiedShow Answer

Why do population II stars contain almost nothing but hydrogen and helium?

Correct AnswerverifiedThis first generation of stars must be made of the elements produced in primordial nucleosynthesis, which had time only to turn 25% of the hydrogen into helium.

In the Big Bang, about 75% of the normal matter by mass was hydrogen atoms, and the other 25% almost entirely helium.

Correct AnswerverifiedShow Answer

Most of the deuterium formed right after the Big Bang

Correct AnswerverifiedShow Answer

Decoupling refers to the separation of matter and antimatter during inflation.

Correct AnswerverifiedShow Answer

If the value of H is doubled, it would also double the age of the universe.

Correct AnswerverifiedShow Answer

What role did Princeton astronomers play in the research on the Big Bang?

Correct AnswerverifiedEven before Bell Labs found it, they predicted the existence of the cosmic microwave background radiation.

Like dark matter, dark energy will also retard the expansion of the universe.

Correct AnswerverifiedShow Answer

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Inverting the Hubble constant ...
View Answer

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False

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This first generation of stars must be made of the elements produced in primordial nucleosynthesis, which had time only to turn 25% of the hydrogen into helium.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Even before Bell Labs found it, they predicted the existence of the cosmic microwave background radiation.

Correct Answer
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